Air-cooled thrust bearing



May 11 1926. 1,584,174

H. A. S. HOWARTH AIR COOLED THRUST BEARING Filed Ma ch 1922 2Sheets-Sheet 1 1! P 10 27 I f '12 50 I xwmw w 5 78 27 I v May 11 1926. vH. A. s. HOWARTH.

" AIR COOLED THRUST BEARING Filed March 16, 1922 2 Sheets-Sheet 2 iz-t5-- N W .29 7.9 76 16 22 JWMM QH'OKIINJA Patented May 11,193.. r v vr 1,584,171 units-n STATES PATENT OFFICE.

HARRY. A. S. HOWAR'FH, F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, BY MES NEASSIGNMENTS, T0 KINGSBUBY MACHINE WORKS, INC., 01' PHILADELPHIA, PENN-'SYLVANIA, A. CORPORATION OF DELAWARE. r

nln-coonsn 'rniws'r BEARING. I Application filed larch 18, 1922. SerialIlia. 544,223.

This invention relates to thrust bearings variety of mechanicalexpressions some of 50 and, more articularly, to means for. disslwhichare shown 0 the accompanying pating the mat engendered by the operationdrawings, but it is to be expressly underof the bearing. v stood thatthe drawings are for purposes While it has heretofore been proposed toof illustration only and are not to be conutilize air circulation forcooling journal strued as a definition of the limits of the 60 bearingsit has been considered necessary in invention reference being had to theapthe case of thrust bearings, owing to the pended claims for thatpurpose. relativel large uantities of heat developed Referring in detailto said drawings, therein y the riction losses, to dissipate wherein thesame reference characters are the heat by circulating a cooling liquidused ,to designate corresponding parts in the a through the bearingparts or the lubricating several figures oil or by circulating thelubricating oil 1 is half axial section of a thrust through externaloil-cooling devices. Where bearlng embodyin the resent invention:

, l the friction losses in the thrust hearing are Fig. 2is a half a-xiasection of another relatively small, however, as is particularly thrustbearing embodying the present inven- 7 true of the flexible or tiltablesegment type tion; of bearing invented by Albert Kingsbury, Fig. 3 isafragmentary section to illusthe quantities of heat to be dissipated aretrate a different form of means for directing" correspondingly less, andit is an object of the interior air circulation.

this invention to provide a thrust bearing Inthe form shown in Fig. 1,10 is a shaft 7 construction wherein the bearing parts and provided, inany suitable way, with a thrust the lubricating oil are maintained at alock 11, of any suitable construction, said proper temperature withoutcirculating athrust block carrying any suitable thrust colcoolin liquidthrough the bearing parts or lar 12 connected therewith in any suitablethe lu ricating oil and without circulating way, asby the dowel pins 13.Cooperating the lubricating oil through external oil coo with thebearing face of the thrust collar 12 ing devices; is a stationary thrustbearing member of any Another object of this invention is to prosuitableconstruction but, in order to reduce vide a thrust bearing constructionwhereby the fric'tionlosses to a minimum, preferably 7 the. heatengendered by the operation of the composed of a plurality of flexibleor tilthearing may be readily dissipated to'the air. able bearingsegments or shoes 15. In the Another objectof this invention is toproconstruction illustrated, each bearing shoe 15 vide a thrust bearingconstruction whereby is mounted one block 16 which, in turn, isdissipation of heat to the air is facilitated tiltably or pivotallymounted on the spher by interior air circulation, or exterior air icalhead 17 of an adjustable bolt 18 received 0 circulation, or both. J inascrewhreaded opening 19.311 the base Another object of this invention isto proring 20, said base ring being supported on vide a thrust bearingconstruction which enthe frame or foundation 21 and suitably pre- 1 40ablesv an eilicient dissipation of heat to the vented from rotation, asby dowel pins 22.

air without the air and lubricating oil being Suitable means, as lockwrenches 23, are prochurned together, even though the shaft vided forretaining the bolts-18 in their ads... have a relatively hi h speed ofrotation. justed positions, and the shoes ,15 are pre- Other objectswill appear as the descripvented from radially-outward and rotation ofthe invention proceeds. tional movement's by the retaining ring 24Stated broadly, the invention comprises and the spacingblocks orprojections 25, re- 1 a thrust bearing having, in combinationspectively. It is to be expressly understood, with relatively-rotatablethrust-bearing however, that the details of construction of members, ahousing or reservoir for the luthe bearing parts per se constitute nopart 0 bricating oil, and means exteriorly of said of the presentinvention.

= housing or reservoiij, or interiorly thereof, YTo flood the thrustbearing 5 rfaces with 1 5' or' both, for conveying and dissipating thelubricant, the bearing is provi ed with an heathof the hearing to theair. oil reservoir .of any suitable cons truction.- i 'The inventionis"cap'able of receiving a. 1n the form shown," the O11 reservoir isshape d I Q formed by the annular space 26 between the interiorretaining wall 27, suitably supported on the frame or foundation 21 andclosely surrounding the shaft 10, and the exterior housing wall 28, alsosuitably supported on the frame. or foundation 21. The level of the oilin the reservoir is preferably main tained above the level of thethrust. bearing surfaces so that the oil may completely fill the spacesbetween and around the bearing shoes 15. As the thrust collar rotates,the

lubricant is drawn betweenthe relatively robearing surfaces to formwedgeoil films in conformity with the principle of operation of the.bearings invented by-AlHert Kingsbury; also, owing to the actatin tionof centrifugal force onthe oil in con tact with and adjacent to therotating parts, the oil is caused to circulate in a generally spiraldirection in the body-portion of the reservoir 26, some of thiscirculating oil returning through passages 29, suitably provided in thebase ring 20, to the annular space .30 at the inner side of the bearingsurfaces, and thence through the spaces between the bearing shoes intooperative relation to the bearing surfaces. A circulation of oil istherefore normally maintained in the reservoir, the major portion ofthis circulation taking place in a generally spiral direction in thespacebetween the exterior periphery of the bearing members and thehousing wall, with which circulating oil the hot oil is mixed as itcomes from the bearing surfaces. If no means are provided fordissipating this heat, the body of oil in the reservoir will rise to atemperature which will impair the efficiency of the bearing and, becauseof this fact, it has heretofore been the practice'to locate in thereservoir a cooling coil, through which a cooling liquid is circulatedto abstract the heat from the oil, or else.

circulate the oil through external cooling de- .vices. Either of thesemethods of dissipating the heat necessitates the use of auxiliarycooling devices, whether interior or exterior of the oil reservoir, andmeans for circulating the cooling liquid or the oil through said coolingdevices. It is the object of the resent invention to eliminate theseauxi iary cooling devices and circulating systems, and to effect thedissipationof heat by its conduction to the air.

' To this 'end, the exterior wall 28 of the oil reservoir, or the wall'of the housing, is provided witha plurality of heat conductingelements, shown as in the form of axially extending ribs 31 spacedaround the periphery "of the reservoir or housing. Any suitable numberof ribs may be employed and they may be of any suitable width andthickness.

These external ribs serve the dual function of providmgheat conductingfins by which circulate 'to' carry ofi the heat delivered thereby. Tofacilitate the conduction of the eat from the oil to the wall of thereservoir or housing, said wall is also preferably rovid'ed' with aplurality of inwardly extending heat conducting elements or ribs 32, ofany suitable number and dimensions, in heat interchanging relation withthe wall of said reservoir or'housing. 'Whereas the external ribs 31 arepreferably disposed in axial planes, however, the internal ribs 32 arepreferably arranged more or less circumfer-' entially or helically so asnot to interfere with the normal directionof circulation of the oil inthe reservoir'under the centrifugal and 32 prefer- Also, if desired, theframe or foundation 21 may be provided with heat-conducting,. ribs, soPOSltIOIlBd as to offer the minimum-resistance to the circulation of theoil, to facilitate heat interchange between the oil and the wall 21.

lVhile the dissipation of heat through the external ribs 31, aided bythe convectional currents of air set up through the channels betweensaid ribs, would probably to effect. an et'fibe sutlicient in some casescient dissipation of the heat from the bear- .ing, I prefer to providethe bearing with means of any suitable construction for positivelycirculating air over the exterior of the housing or reservoir. andthrough these channels. In the form shown, a fan 34, of any suitableconstruction, is suitably mounted on or driven bythe shaft-10, and thebearing housing is vertically extended as shown at 35, and providedwithan exterior hood or casing 36, to chamber 37 through which the airchannels between the ribs 31 communicate with the fan chamber 38.- Thechannels between the ribs 31 may, if desired, be extended to the fanchamber 38 by extending the ribs 31 up the side of the verticalextension 35 of the housing or, as shown, the ribs 31 may be terminateda short distance within the lowerend of the hood 36. Also, if desired,the casing or hood 36 can be extended near- 1y to the base of thehousing or reservoir,

preferably in substantially parallel relation rovide an annularto theexterior wall thereof, or'it can be extended directly to said base andprovided with any suitable air admitting openings communicating with thenterior thereof 1 be taken of the circulation of air induced by therotation of other partsythus for example when the bearing s used inconjunction with a generator the casing 36 could 'be'extend ed so thatair setin motion by the rotor of the generator will flow, throu h thechannels afforded by the exterior ri s 31. As the oil moves outwardunder the action of centrifugal force, owing to the rotation of thethrust collar, the'movement of its thereto so that free surface inducesa corresponding movement of the air adjacent thereto,and I referablytake advantage of this induce circulation of air within the housiiig orreser-' I voir to further aid in the dissip tion of the heat to theexterior air. To th s end, the portion of thehousing or reservo'r 33which overlies the free surface ofthe oil preferably extends inrelatively close proximity the circulation of the air induced by themovement of the oil tends to build'u a pressure in the air at the outerends 0 the channels 39 included between each successive pair of inwardlyextending ribs 32. These chahnels 39 communicate at their outer endsthrough apertures 40 suitably provided in the ribs 32 with inwardlydirected air passages or channels 41 of larger cross section than thechannels 39. Ac-

cordingly, assindicated by the arrows in Fig. 1, the'air drawn throughthe channels 39 by the movement of the oil flows through the apertures40 into the channels 41, and thence returns through the latter to the,inner space of the housing, the air taking up heat from the oil anddelivering it to the wall of the housing or reservoir. f

In place of providin separate air passages or channe s 41 in t e wall ofthe housing or reservoir as shown in Fig. 1, the space between eachsuccessive 3.11 of inwardly'projec tinga ribs 32, and tween the freesurface of the oil and the overlying ortion 33 of the housing orreservoir, may

e p'rovided,.as shown in Fig. 3, with an mterior artition 42 extendingapproximately paralleii to the free surface of the oil and in closeproximity thereto so as to provide a relatively narrow air passage orchannel 43 which cbmmunicates at its outer end around one end of "thepartition 42 with the inwardly directed air passage or channel 44 oflarger cross section provided above said partition. The circulation ofair induced 'by' the movement of the oil is shown by the arrows and, asin the construction shown in Fig- 1, facilitates the dissipation highspeed, means should be of the heat to the wall of the housing J orreservoir. 1 I

When the shaft rotates at a relatively provided .to prevent the oil andair from being churned together at the free surface of the oil, becausethe lubricatingfcapacity 1 of the oil may become seriously affected if aconsiderable quantity I the same. In the form shown in Fig. 2, I haveillustrated churning of face of the oil when the runner periphery movesat a relatively high speed Said means may be of anysuitableconstruction, the form shown comprisin an air sealrin 45,0f theconstruction disc osed and claims in the application of 'AlbertKin'gsbury and myself erial No. 534,970 filed Feb. 8 suppprted in anysuitable way, as bybrack- ,ets 46 from the base ring 20,

of air becomes *mixed' Wlth.

and a baffle v means for preventing the ;o1l and air at'the freeflsurofvthe. oil'from the air' seal ring 45 to a-suit-,

able projection or ledge housing or reservoir. In the constructionillustrated in Fig. 2 the outer wall 28 of the reservoir or housing isprovided with an inwardly directed wall 48 on which the outer edge ofthe baflle plate 47 is mounted,' andinwardly extending ribsi49,correspon ing to the ribs 32, extend along the inner face of the outerwall 28 to its junction with the inwardly directed wall '48, and thenceinwardly across the latter. Inwardly extending ribs 50, which correspondwith the horizontally extending portions of the ribs 32 in theembodiment of Fig. 1, are also. provided and pro ect downwardly from theoverlying portion 33 of the housing or reservoir into the free surfaceof the oil.

'In orderthat the the baffle plate 47 may be provided with a pluralityof apertures 51 and, and in order that the oil circulating through saidapertures may return freely to the body of the oil in the reservoir,

ripheral wall of the reservoir. In the form s own, assages 52 areprovided between adjacent ri s 49, and communicate at their oppositeends with the body of oil above the wall 48 and with the main body ofoil in the reservoir 26 adjacent the bottom of the same. Therefore someof the oil moved outwardly by the action of centrifugal force may passup through the apertures '51 into heat interchangin relation with theribs 50. and thence ret rn to the body .of oil in the reservoir throu hthe passages 52 while. at the same time,-t oil with the air at the freesurface of the oil is prevented by theair seal ring 45 and baflle plate47. If desired, the q ua tity of oil adjacent the on the wall of the thefull width of.

oil may circulate into .I heat interchanging relation with theribs 50,

suitable apertures or passages are provided through the wall 48 echurmng of the y fiowing throu h the apertures 51 Ina be increased by sapingt e periphery the thrust collar as shown at 53 so that it tends todirect the oil set inmotion by the rotating 'an inverted truncated cone,may be posioil moving out tioned in the path of the centrifugal forcewardly under the action of so as to deflect said oil upwardly throughthe the housing is shown apertures 51.

The clrcula-tlon of an induced by the movement of oil at its freesurface may also be taken advantage of in dissipating the heat, the airchannels 39 between successive pairs of ribs communicating adjacenttheir outer ends with air passages 41 formed in the wall of the housingas in the embodiment of Fig. 1or in place thereof, the constructionshownin Fig. 3 may be employed if desired. In the embodiment of Fig. 2

as formed in two sections separable at the joint to facilitate. accessto the interior of the oil reservoir and to the bearing parts. Thehousing shown in Fig. 1 could be similarly constructed in two sectionsif desired.

In operation, the oil circulating within the reservoir 26 under theaction of centrifugal force .is' brought into heat interchangingrelation with the peripheral wall of the housing or reservoir and givesup its heatthereto, this conduction of heat to the exterior wall of thehousing or reservoir being greatly facilitated by 32, or 49, 50, whichproject a substantial distance into theoil along both its periphery andits free surface so as to constitute heat conducting elements fortransferring the heat to the exterior wall of the reservoir or housing.From the exterior wall of the housing or reservoir the heat is readilydissipated .by the action of the exterior heatconducting elements 31 andthe currents of air which flow through the channels afforded by saidelements, particularly when a vigorous circulation of air over andbetween the ribs 31 ,is maintained byair circulating means. The movementof the oil at its sur: face induces circulation of the a'irwithin thehousing or reservoir, and when the bearing is provided with interior airassages or channels as illustrated, this .circu ation of air furtherfacilitates the dissipation of the heat to the housing wall and outside,air'. When the speed of rotation of the shaft is such that there isdanger of'the oil and air j being churned together,atthe free surface ofthe oil, means may be employed, as shown in Fig. 2, for preventingsuchchurmn of email and air without interfering with the dissipation of,heat-through the wall of thehousing or reservoir.

It will therefore be perceived that I have reservoir. Also,

the inwardly, projectmg ribs the s irit of m asureinvented athrustbearing wherein the oil housing and the heat dissipated into theoutside air without requiring the use of a system for circulating acooling liquid through is caused to circulate in heat interchangingrelation with the wall of the reservoir or oil through exheat-radiatingelements, but they provide exterior air channe s through which acirculation may be maintained by convection, or by air circulatingmeans, to readily abstract heat from the wall of the housing or byproviding interior heatconducting elements in heat interchangingrelation with the exterior air channels, the heat may be readilyabstracted from the body ofthe oil and conducted to the walls of saidchannels for Additionally, means have been provided whereby thecirculation of air within the housin in facilitating the dissipation ofheat. Moreover, these several features of construction have beencombinedwith means for preventing churning of the air and oil at thefree surface of the oil without impairing the capacity of the housing orreservoir to dissipate the heat developed by the friction in thebearing.

While the invention has been shown as embodied only in bearings forvertical shafts, it is to be expressly. understood that theinvention mayalso be ap lied to bearings for horizontal or inclined s afts.

while the embodiments of the invention ilscribed with considerableparticularity, it is to be expressly understood that the invention isnot limited thereto, as the same is capable of receiving a variety ofmechanical expressions, some of which will now readily suggestthemselves to those skilled in the art, while-certain features may beused without other features thereof, and changes may be made in thedetails of construction and arrangement of parts without departing fromthis invention. Reference is dissipation as aforesaid.

Furthermore,

there ore to be had to the claims hereto a pended for a definition ofthe limits of said lnvention. I

lVhat is claimed is 1. In a thrust bearing, the combination withrelatively-rotatable thrust-bearing members, of a housing thereforproviding a. reservoir for the lubricatingoil in which a circulation ofoil is maintained, said housing having heat conducting ribs inheat-transferring relation with-said housin and projecting intoheat-interchanging re ation with the circulating oil in said reservoir.

' the I combination thrust-bearing 2. In a thrust bearing, withrelatively-rotatable members, of a housin reservoir for the-lubricatincirculation'of oil is maintained, said housing having air channels inheat-interchanging relation with the circulating oil in said oil inwhich a reservoir, and heat-conductin ribs in heat culating air throu hsaid engthwise of bearing members therefor, of a housing for the bearingincluding a reservoir for the lubricating oil, said housing beingrovided with airchannels extending the shaft in heat-interchangingrelation with the bearing, elements for conducting heat from the oilinsaid reservoir to the walls of said channels, and means driven bytherotationof said shaft for circhannels.

5. In a thrust earin the combination with relatively-rotatab ethrust-bearing members, of a housing therefor including an oil reservoirand having exterior heat-con.-

with ducting ribs over and between which air may circulate to cool theoil in said reservoir,

and means whereby airis circulated through the channels afforded by saidribs. p

6. In a thrust beariifg,.the combination-with relatively-rotatablethrust bearing members, of a housi therefor including'an oil reservoirand aving exterior heat-conducting ribs over and between which air maycirculate to cool the oil in said reservoir, means whereby air iscirculated through the channels afforded by said ribs, and means toconduct heat from the oil' to the walls of said channels.

' 7. In a thrust bearing, the combination relatively-rotatablethrust-bearing members, of a housing reservoir for the lubricating oil,said housing having vertically-extending exterior ribs for dissipatingheat and providing exterior channels through which air may circulatevertically. a T'.

8. In a thrust bearing, the combination of relatively-rotatablethrust-bearing members, of a housing therefor including an oil reservoirand having exterior air channels throu h which air may circlatetoabstract heat rom the oil in said reservoir, and

therefor providing a thev combination with a shaft and relativey-rotatable thrust-.

ervoir and having exterior I to cool the bearing,

of said housing therefor including a or whereby means whereby air iscaused to flow through said channels.

9. In a thrust bearing, the combination of relatively-rotatablethrust-bearing members,

of a housing therefor including an oil reservoir and having exteriora'ir channels throu h which air may circulate tos'abstract I heat mm theoil in said reservoir, interio heat-conducting elements for conveyingheat to the walls 'of said channels, and means whereby air is caused toflow through said channe s.

10. In a thrust bearin with relatively-rotatabfii members, rior ribs inheat transferring relation therethrust-bearing with and projecting intothe circulatin oil to direct the oil circulation and abstract eat fromth voil. r

11. In a thrust bearing, the combination with relatively-rotatablemembers, of an oil reservoir havin ribs to direct the oil circulation anabstract heat from the oil, andexterior air channels through which airmay circulate to'cool the bearing. Y

12. In a thrust bearing, the combination with relatively-rotatablethrust-bearing members, of an oil reservoir havin ribs to direct the oilcirculation and heat from the oil, exterior air channels on saidreservoir, and means whereby air is caused to flow through saidchannels' 13. Ina t rust bearin with relatively-rotatab e thecombination of an oil reservoir having inte-I thrust-bearing interiorinterior abstract 95 the combination thrust-bearing members, of ahousing providing an oil reschannels through which air may circulate andmeans in the interior whereby air currents set up .bymovement of the oilmay assist inicoolingthe bearing.

14. In a thrust bearin with relatively-rotatable members, of a housingproviding an oil reservoir and having exterior channels through whichair may circulate to cool the bearing, and channels interiorlyof thehousing through which air movement of up heat to said housing.

15 Ina thrust bearing,

with: relatively-rotatable thrust-bearing members, of a'housi-ngproviding an oil res- -channels through.

ervoir and having exterior which air may-circulate to cool the beartheoil, and air ch a'nne with the inter-rib spaces communicat ng lation' isset up between said ribs.

set in motion by the the oil may circulateto give j thecombinationthrust-bearing the combination ing, ribs on said housin Iprojecting into above the level of the 011 whereby an interior aircircu- R5 16. In a thrust bearing, the combination withrelatively-rotatable members, ervoir,

and air channels in said housing thrust-bearing of a'housmg providingan-oil res-' the air set in motion-by the 'lation of the oil may give upits heat to members, of a housing therefor providing the housing I A anoil reservoir and having .ribs projecting 17. In athrust bearin thecombination into the free surface of the oil, means in withrelatively-rotatab e thrust-bearing said reservoir to prevent churningof the t members, of a housing providing "an oil refree surface of theoil, means whereby'the servoir, and ribs on said housing projecting oilmay circulate to and from the free surinteriorly thereof and providingchannels face of the oil, and means in said housing through which theair insaid housing may for directing the air circulationwhereby the Icirculate to ive u heat to said housing; movin air' may give up heat tothe housing 10 '18. In a t rust caring, the combination and ri s.

with relativel -rotatably thrust bearing 25. In a thrust bearing, thecombination members, of a housing providing an oil reswith relative]-rotatable thrust-bearing ervoir, I'lbS on saidhousing projecting intomembers, of a casing therefor providing the 011, and air channelscommunicating an 011 reservoir and havin 'ribs projecting 15 with theinterrib spaces above the level of into the free surface of t e oil,meansin the oil whereby air currents may be set up said reservoir toprevent churning of the s in said housing to convey heat thereto. freesurface of the 011, means whereby the 19. In a thrust bearing, thecombination oil may circulate to'and from the free surwithrelatively-rotatable thrust-bearing face of the oil, and means forcirculating 0 members, of a housing therefor providing an air over theexterior of said housing.-

. oil reservoir, means in said housing for di- 26. In a thrust bearing,the combination recting the air circulation whereby heat with relatvely-rotatable thrust bearing may be conveyed by the air to saidhousmembers, of a housing therefor providing ing, and means forcirculating air over the an oil reservolr and having ribs projecting j.exterior of said housing. into the free surface of the oil, means in20. In a-thrust bearin the combination said reservoir to. preventchurning of the with relative] -rot-atab e thrust-bearing free surfaceof the oil, means whereby the .members, of a ousing therefor providing011 ma circulate to'and from the free suran oil reservoir, means in saidhousing for face 0 the oil, and hea -conducting elements directing theair circulation whereby heat on the exterior ofthe housing for giving upma be conveyed by theair to-said housing, heat. to, the air.

and exterior heat-conducting ribs on said 27./In a thrust bearing, the:combinationhousing. V with relatively-rotatable thrust bearing 21.v In athrust bearing, the combination. members, of a housing thereforproviding an 35 {with relatively-rotatable thrust-bearing oil reservoirand .havlng' ribs projecting into I members, of a housing providing anoil resthe .free surfaceof'th' oil, means in said 190 @ervoir meansadjacentthe periphery of the reservoir toprevent c urning' of the freerotatable bearing member to prevent churnsurface of the oil, meanswhereby the oil ing of the air and oil, heat-conducting ribs1maycirculate to and from the free surface fon thehousin projecting into thefree surof the oil, and air channels on the exterior face of the oi andmeansin the reservoir of the housing through which air may cirwherebythe circulating oil is directed into culate to abstract heat from saidhousing. heatdnterchanging relation with said ribs. k 28. In a thrustbearing foravertical shaft, 22. In athrust bearin ,the combination thecombination of relatively-rotatable with relatively-rotatab ethrust-bearing thrust-bearing. members, of a housing therei members, ofa housin providing an oil resfor providing an 011 reservoir andextending ervoir and having ri s projectin into the over the freesurface of the oil in the. reserfree surface, of the oil, and a be eplate in voir, and ribs projecting into the oil from said reservoirbelow the free surface of the the peripheralv and over-extendingportions 59 oil, said bafiie plate beingapertured to perof the housin toconduct heat thereto.

. F members, ofa

- "mit circulation of the oil into heat-inter- '29. In at rust bearingfor a vertical changing relation with said ribs. shaft, the combinationof relativel -rotat- "23. In a thrust bearin ,the combination ablethrust-bearing members, of. a musing.

with relati-veljl-rotatab e. thrustebearing therefor providing an oilreservoir and exousing therefor providing tending over. the freesurfaceof the oi1,in

- i an oil reservoir and havin' ribs projecting the reservoir, ribsprojecting" into the oil thesfree surface-0f t e" oil, means in from theperipheral and over-extending por-. said reservoir to prevent churningof the tions of t 0 housing to conduct heat thereto,

surface of theoil, and means whereby. and exterior heat-conducting ribson said .oilmay circulateto-and-from the free surhousin face of the'oiland. intoheat-interchanging 30.1 na thrust bearin the combinationrelation with said'ribs, j In athrust bearin the combination members, 0on forthe bearing in-- with relagivelfi-rotatab e thrust-bearing. w i' hrelatively\-rotatabFd thrust-bearing eluding areservoir forthe'lubricating oil the combination reservoir, ribs on said housing"projecting.

ing member,

' with relatively and providing channels interiorly thereof 7 air insaid housing may throughwhich the circulate to give u and exterior heat;issipatingf' ribs ,on said housing. Y 32. n a-thrust bearing, thecombination with relatively rotatable thrust-bearing members, of ahousing proy idingan oil res ervoir, ribs on said housing (projectinginteriorly thereof and provi ing channels through which the air in saidhousing may circulate to give up heat to said housing, ex-. terior airchannels on said housing, an means whereby air is circulated t roughsaid channelsto'. abstract heat therefrom. 33. Ina thrust bearing for avertical shaft, the combination of relatively rotatable thrust-bearingmembers, of a housing thereior providing an oil reservoir'andeig tendingover the surface of the oil in said reservoir, and ribs projectingdownwardly into the oil from the over-extending portions of saidhousing. i

34. In a thrust bearing, with relatively rotatable members, oia housingervoir in which a circulation of oil is maintained by the rotation ofthe rotatable bearribs on said housin for-dissipating the heat from thecircu and means in said reservoir hurning together of the air -35. In athrust bearing, with relatively rotatable thrust-bearing members, of ahousing roviding an oil reservoir in which a circu ation of oil ismaintained by the rotation of the rotatable bearing member, exteriorribs on said housing providing channels through which air may circulate,and means in said reservoir for preventing churning togetherof the airand the combination thrust-bearing for preventing and 011.;

a thrust bearing, the combination rotatable thrust-bearing members, ofahousing roviding anoil reservolr 1n which a one ation of 0111smamtained by the rotation of the rotatable bearing member, ribs on.saidhousing, means whereby airis ribs to abstract heat therefrom, andmeans in said reservoir for preventing churning together of the air andoil. 1

: 37..In a-thrust beari the combination with relatively rotatab ethrustg bearing members, of a housing providing] an .01

thrust-bearing o11. ;38. In. a thrust bearing, [with relativelyrotatable thrust bearing heat to said housing,

providlng anoil resating oil,

the combination caused to flow between the reservoir-in whichacirculation otoil is maintained by the rotation of the rotatable,bearing member, exterior heat-conducting elements on'said housing,interior heat-conducting elements projecting into the oil in saidreservoir, and ineans in said'reservoir preventing churning together ofthe air'and the combination members, .of a reservoir. in

maintained by the rotation of the rotatable bearing member, interiorribs projecting into the circulating oil for conducting heat from saidoil to the housing, and means in said reservelr for preventing churningtogether of the air andoil;

housing providing an Oll which a circulation of oil is v 39. In. athrustbearin the combination with. relatively rotatab e thrust-bearing amembers, of a housin reservoir andhaving-ri projecting into the freesurface of the oil, and means in said reservoir for deflecting oil intoheat-interproviding an 01 changingrela'tion with said'nbs. i

40. In a'thrustibearing; he combination with relativel frotatablethrust-bearing members, of a. ousing therefor providing a reservoir forthe lubricating oil in which a circulatio of oil is maintained, ribs onsaid hOllSlIl" o3ect1ng'1nt0 the circulating oil to conductheattherefrom tothe housing, and exterio the heat. I v

I 41. In a thrust bearing, the combination with relatively-rotatablethrust-bearing members, of a housing therefor providing a reservoir forthe lubricating oil in which a clrculationof oil is maintained, ribs onsaid hi'usln vproiiaectin into the circulating oil t con uct' eat terefrom to the housing, exterior ribs onfsaid housing for dissipatingthe heat, and means associated with said bearing whereby air, iscirculated between saldexterior ribs to facilitate ofhea't. y y

42, In a-thrust'bearing, with relatively-rotatable members, of a housingfor the bearing including a reservoir for, the-lubricating oil, airchannels formed exteriorly of said housing, means whereby airis causedto flow through said channels, and means whereby the combination thedissipation r ribs' on sa d housing for'dissipating thrust bearing theheat of thelub ricating oilis transferred tothe air circulating throughsaid channels. 7 #3. In a thrust bearing the combination w th a Shaftand relatively-rotatable members fortaking the housing for the bearinfor, the lubricating oil cooling sa d oil including air channels outside of said bearinghousing, a fan driven by said shaft for circulatingair through including a reservoir said -hannels,\.andmeans whereby theheat and means for airthrust of said shaft, a i

of said oil is conveyed the-air circulating through said channels. I

, tion with relatively 5 members,

a thrust bearing, in combinaa reservoir for the lubrioati ribs in saidreservoir. projecting into for cond ucting heat from said pil -rotatablethrust-bearing the oil to the wall of said reservoir, and means wherebyalr is circulated over the wall of said reservoir to abstract heattherefrom.

HARRYYAI. s. HOWARTH;

